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Express each of the following as a sum o...

Express each of the following as a sum or difference.
`sin 5 theta sin 4theta`

Text Solution

Verified by Experts

The correct Answer is:
(i) `1/2 [sin 63^(@)+ sin 7^(@)]`
(ii) `1/2 (sin 6x+2x)` (iii) `1/2 [sin 12 theta+sin 8 theta]` (iv) `1/2 [cos 7 theta+ cos 3 theta)` (v) `1/2[cos theta-cos 9 theta]`
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